Do we extend the option to fine-tune/customize Composer?
We don't do fine-tuning as it is classically defined, but you can give hints by adding "Be detailed" to your prompts.
The best way to construct a long response is going to be prompt engineering and knitting multiple queries together.
Alternatively, add "Be concise" to make the response shorter.
Why am I getting a 404 error when I attach my .xlsx to Composer and ask a question?
.xlsx is currently not supported in Composer.
Why am I getting a 400 error: “Mixed source type detected”?
Problem
Composer currently does not support mixing embedded and non‑embedded documents within the same request.
Solution
To resolve the error, choose one of the following:
Embed all documents before querying, or
Set
ragskip=trueto allow non‑embedded documents without triggering a mixed‑type error.